The Rock Head is one of the UEF's starting land units. It is remarkably cheap and easy to produce making mass-production a cakewalk.
Its upgrades include: Stacked Gauss Gun (adding a third barrel), Personal Shielding and a 'Linked-Railgun' SAM launcher. The Rock Head is a remarkable foe to deal with other basic land units and, whilst produced en-mass, a troublesome base wrecker.
However, the tank has several disadvantages. The first is dealing with aircrafts. It has trouble taking them down, even with the Linked-Railgun AA upgrade researched. The second drawback is that an Experimental will certainly take down Rock Heads if their number is not large enough
Although they are best mixed with Titans in the early game, researching the "Stacked Gauss Cannons" makes the Rock Head a better choice with similar DPS, better range, and more armor. Titans should be used as raiders in the late game.
Rock Heads have a less damaging AA weapon than the Titan.
Rock Heads are considered the best standard (non ACU/Experimental) unit in the game for raw firepower and health for their cost. It crushes the Yenzoo Tank in a straight fight in all categories except shielding, though Rock Heads have more standard health. Superior to Titan Assault Bots, feature better health and offense than the Loyalist Assault Bot, and beats the Harvog Assault Bot in health and matches it in firepower (75 with Stacked Gauss Cannons.)
Rock Heads however lack the special abilities of the other armies: Teleport, Hover, Jump Jets and Power Detonate often meaning that they can be out-manoeuvred rather easily.
When fully upgraded, the Rock Head Tank has more health than any other standard land unit in the game (that is, excluding ACUs and experimentals). Counting Health and Training upgrades, its health raises to 2625. If a Rock Head goes through all 5 levels of veterancy (not likely to happen without considerable care), its health raises to 3375, not including the 150 health bonus from shields. Although the Illuminate land units benefit from twice the amount of shielding, they lack any Health upgrades and thus do not match up to the Rock Head's durability.
Although quite independent and capable of dealing with almost any target quickly, it is best to mix them with Demolishers, which provide more range and damage, better splash damage, and oddly enough, almost double the anti-air power of a Rock Head (Demolisher does 60).
Try to mix some Archanists with the Rock Heads so they fare much better against Gunships and Bombers. The Railgun AA upgrade reduces this need however.
The new Afterburn ability allows the Rock Head to receive a large speed boost for a small amount of time, allowing it to charge into battle, or retreat at a much faster speed. (This ability is found in the Infinite War DLC pack 1).